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A lithium ion battery, positive electrode composite material and preparation method thereof

A technology of lithium-ion batteries and composite materials, which is applied in the field of lithium-ion battery manufacturing, can solve problems such as deterioration of high-temperature storage performance, and achieve the effects of easy manufacturing process, easy industrial promotion and application, and good circulation

Active Publication Date: 2015-08-05
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of positive electrode composite materials can make the battery cell have the characteristics of high specific capacity, good cycle, and low cost, but its high-temperature storage performance deteriorates sharply with the increase in the proportion of binary or ternary materials, especially at high temperatures. The storage size expansion is obvious

Method used

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  • A lithium ion battery, positive electrode composite material and preparation method thereof
  • A lithium ion battery, positive electrode composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Make 100 lithium-ion batteries with a model of 423450A, and the specific preparation steps are as follows.

[0019] 1) Positive electrode ingredients.

[0020] Firstly, the positive electrode active material is prepared, the coating solution is mixed with the positive electrode active material by the spray dispersion method, the mixture is dried after washing, and then the sintering heat treatment is performed in an inert gas atmosphere at 400-600°C. Specifically include the following steps:

[0021] 01) LiCoO with a particle size D50 of 9μm~20μm 2 LiCo particles and primary particles with a particle size D50 of 0.5μm~5μm and a secondary agglomeration particle size D50 of 5μm~20μm 0.2 Ni 0.8 O 2 The positive composite active material composed of binary materials is added to the spray fluidized bed dryer, in which LiCo 0.2 Ni 0.8 O 2 The weight ratio of the positive composite active material is 10%-50%.

[0022] Turn on the induced draft fan and blower, observe the fluidization ...

Embodiment 2

[0053] Prepare 100 lithium-ion batteries with a model number of 423450A. The preparation steps are different from those in Example 1. In step 1) positive electrode ingredients, the positive electrode composite active material in the step of preparing positive electrode composite materials is made of LiCoO 2 And LiCo 0.2 Ni 0.4 Mn 0.4 O 2 Ternary material composition, and LiCoO 2 : LiCo 0.2 Ni 0.4 Mn 0.4 O 2 The weight ratio of :SP:PVDF:NMP is 80:20:2:2:40, and the other steps and formula are the same as in Example 1.

[0054] The battery charging and discharging, cycling and high-temperature storage performance test conditions and methods are the same as in Example 1. The test results are shown in Table 1 and Table 2.

Embodiment 3

[0056] Prepare 100 lithium-ion batteries with a model number of 423450A. The preparation steps are different from those in Example 1. In step 1) positive electrode ingredients, the positive electrode composite active material in the step of preparing positive electrode composite materials is made of LiCoO 2 And LiCo 0.4 Ni 0.4 Mn 0.2 O 2 Composition, and LiCoO 2 : LiCo 0.4 Ni 0.4 Mn 0.2 O 2 The weight ratio of :SP:PVDF:NMP is 50:50:2:2:40, and the other steps and formula are the same as in Example 1.

[0057] The battery charging and discharging, cycling and high-temperature storage performance test conditions and methods are the same as in Example 1. The test results are shown in Table 1 and Table 2.

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Abstract

The invention discloses a lithium ion battery, a cathode composite material, and preparation methods for the lithium ion battery and the cathode composite material. The cathode composite material comprises active cathode substances and a surface coating film, wherein the active cathode substances comprise LiCoO2 and LiCo1-y-yNixMnyO2; values of x, y and the summation of x and y are ranged from 0 to 0.9; and the surface coating film comprises the components of carbon and metallic or non-metallic oxides. The invention can improve the stability and security of the cathode composite material at high temperature at the same time of ensuring the high specific capacity, high recyclability and relatively lower cost of the composite material. The methods are simple and easy to industrially popularize and apply, and are implemented by manufacturing procedures easy to control.

Description

Technical field [0001] The invention relates to the field of lithium ion battery manufacturing, in particular to a lithium ion battery and a cathode composite material thereof, and a preparation method of the cathode composite material and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, high specific power, good cycle performance, no memory effect, and no pollution. They are widely used in various electronic products such as mobile phones, mobile phones, cameras, and notebook computers. Among them, the performance of the cathode material has a direct impact on the performance of the lithium-ion battery. The commercial cathode material of the battery uses LiCoO 2 Mainly, but cobalt is more toxic, and cobalt resources are scarce, expensive, and poor safety performance. In particular, its gram capacity is only 140-145mAh / g, and the capacity has almost reached its limit. These shortcomings limit LiCoO 2 Theref...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391H01M4/131H01M10/058H01M10/0525
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 饶汝宇何伟王小龙杨小玲鲁春艳龙凤
Owner SHENZHEN BAK POWER BATTERY CO LTD